Police did not release additional details, including the type of injuries the victims suffered. No one has been arrested. The victims' names have not been released.

The two were found on a quiet street of primarily single-family homes.

"This is the first time I've run into anything like this," said George Griffin, 80, who found the man lying in a pool of blood outside his house and the woman across the street, moaning in pain. "I didn't sleep last night."

A neighbor, Elvie Villanueve, 59, saw paramedics strip the male victim and work to save him. At about 11:30 p.m., fire crews began hosing down the street and washing away his blood.

"It's really scary," she said. "We were so nervous. It's a quiet neighborhood. This has never happened before."